import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '../components/Login.vue'
import Home from '../components/Home.vue'

Vue.use(VueRouter)

const routes = [
  {
    path: '/',
    redirect: '/login'
  },
  {
    path: '/login',
    component: Login
  },
  {
    path: '/home',
    component: Home
  }
]

const router = new VueRouter({
  routes
})
// 挂载路由导航守卫
// to 将要访问的路径  from 代表从哪个路径跳转而来  next是一个放行函数
router.beforeEach((to, from, next) => {
  if (to.path === '/login') {
    return next() // 正常放行
  }
  const tokenStr = window.sessionStorage.getItem('token') // 获取token
  if (!tokenStr) {
    return next('/login') // 如果没有token 强制跳转到login页面
  } else { next() }
})
export default router
